Re: Encrypt data...

Aww! Neat! That look better than the one I came up with. Thanks for your time on this one. Thanks, FletchSOD "Tom Rogers" <trogers@kwikin.com> wrote in message news:24214224788.20020926115359@kwikin.com... > Hi, > > Thursday, September 26, 2002, 4:45:04 AM, you wrote: > SF> How do I encrypt the data and decrypt it back using PHP? I do know that hte > SF> random number can not be used becuase it will make it impossible to decrypt > SF> it. > > SF> Thanks! > > Here is a simple class for encoding and decoding: > > class encrypt_class{ > var $secret; > function encrypt_class(){ > $this->secret = 'this is a very long key, even too long for the cipher'; > } > Function encode($id){ > $eid = $iv = 0; > $len = strlen($id); > $id = $len.'-'.$id; > $td = mcrypt_module_open(MCRYPT_TripleDES, "", MCRYPT_MODE_ECB, ""); > $key = substr($this->secret, 0, mcrypt_enc_get_key_size ($td)); > $iv = pack("a".mcrypt_enc_get_iv_size($td),$iv); > mcrypt_generic_init ($td, $key, $iv); > $eid = base64_encode(mcrypt_generic ($td, $id)); > mcrypt_generic_deinit($td); > return $eid; > } > Function decode($eid){ > $id = $iv = 0; > $td = mcrypt_module_open (MCRYPT_TripleDES, "", MCRYPT_MODE_ECB, ""); > $key = substr($this->secret, 0, mcrypt_enc_get_key_size ($td)); > $iv = pack("a".mcrypt_enc_get_iv_size($td),$iv); > mcrypt_generic_init ($td, $key, $iv); > $id = mdecrypt_generic ($td, base64_decode($eid)); > $len = strtok($id,'-'); > $id = substr($id,(strlen($len)+1),$len); > mcrypt_generic_deinit($td); > return $id; > } > } > > > Usage > > <? > $word = 'Hello'; > $e = new encrypt_class(); > $encrypted = $e->encode($word); > echo "encrypted = $encrypted <br>"; > $decrypted = $e->decode($encrypted); > echo "decrypted = $decrypted <br>"; > if($word == $decrypted){ > echo "They match <br>"; > } > else{ > echo "Oops they don't match <br>"; > } > <? > -- > regards, > Tom >